Comment 5 for bug 6457

The current plan is:
* A checkbox next to anyone you have permission to unsubscribe.
* A checkbox next to your name, representing whether you've subscribed or not.
* Changing any checkbox from its initial value reveals mini Cancel and Confirm buttons.
* Clicking "Subscribe someone else" reveals a form with mini Cancel and Confirm buttons.

This would protect against accidental clicks, without requiring extra page loads.